treatment  lat     lon      day  bottle    Fe     error_analytic  
T0         -76.50  173.47   0    T0        0.56   nd              
HLLT       -76.50  173.47   8    10-12     0.12   0.004           
HTHL       -76.50  173.47   8    22-24     0.04   0.006           
LLHT       -76.50  173.47   8    13-15     0.1    0.002           
LLLT       -76.50  173.47   8    4-6       0.14   0.008